STEP 1. Check harness connector A-37X at MFI relay for damage.
STEP 2. Check the MFI relay.
(1) Remove the MFI relay.
(2) Check for continuity between the MFI relay terminals No. 1 and No. 3.- There should be continuity.
(3) Use jumper wires to connect MFI relay terminal No. 3 to the positive battery terminal and terminal No. 1 to the negative battery terminal.
(4) Check for continuity between the MFI relay terminals No. 4 and No. 2 while connecting and disconnecting the jumper wire at the negative battery terminal.- Continuity (2 ohms or less). <Negative battery terminal connected>
- Should be open loop. <Negative battery terminal disconnected>
(5) Install the MFI relay.
Is the measured resistance normal?
Go to Step 3. Replace the MFI relay. Then confirm that the malfunction symptom is eliminated.
STEP 3. Measure the power supply voltage at MFI relay harness side connector A-37X.
(1) Disconnect the connector A-37X and measure at the harness side.
(2) Measure the voltage between terminals No. 3, No. 4 and ground.- Voltage should be battery positive voltage.
Is battery positive voltage (approximately 12 volts) present?
Go to Step 4. Repair harness wire between fusible link (36) and MFI relay connector A-37X (terminals No. 3, No. 4) because of open circuit or short circuit to ground. Then confirm that the malfunction symptom is eliminated.
STEP 4. Check harness connector B-27 at ECM for damage.
STEP 5. Measure the ignition switch-IG signal voltage at ECM harness side connector B-27.
(1) Disconnect the connector B-27 and measure at the harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 92 and ground.- Voltage should be battery positive voltage.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is battery positive voltage (approximately 12 volts) present?
Go to Step 13. Go to Step 6.
STEP 6. Check harness connector C-403, C-417 at ETACS-ECU for damage.
STEP 7. Measure the ignition switch-IG signal voltage at ETACS-ECU harness side connector C-417.
(1) Disconnect the connector C-417 and measure at the harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 6 and ground.- Voltage should be battery positive voltage.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is battery positive voltage (approximately 12 volts) present?
Go to Step 12. Go to Step 8. <Vehicles without KOS> Go to Step 10. <Vehicles with KOS>
STEP 8. Check harness connector C-309 at ignition switch for damage.
STEP 9. Check the ignition switch
STEP 10. Check harness connector C-14 at OSS-ECU connector for damage.
STEP 11. Check for open circuit and short circuit to ground between OSS-ECU connector C-14 (terminal No. 7) and ETACS-ECU connector C-417 (terminal No. 6).
STEP 12. Check the continuity at ETACS-ECU side connector C-403 and C-417.
(1) Disconnect the connector C-403, C-417 and measure at the ETACS-ECU side.
(2) Check for the continuity between connector C-403 (terminal No. 10) and connector C-417 (terminal No. 6).note | Connect the positive side of circuit tester to connector C-403 (terminal No. 10). |
Does continuity exist?
Repair harness wire between ETACS-ECU connector C-403 (terminal No. 10) and ECM connector B-27 (terminal No. 92) because of open circuit or short circuit to ground. Then confirm that the malfunction symptom is eliminated. Replace the ETACS-ECU. Then confirm that the malfunction symptom is eliminated.
STEP 13. Check harness connector C-403, C-417 at ETACS-ECU for damage.
STEP 14. Check the continuity at ETACS-ECU side connector C-403 and C-417.
STEP 15. Check harness connector C-309 at ignition switch for damage.
STEP 16. Check for harness damage between ignition switch connector C-309 (terminal No. 2) and ETACS-ECU connector C-417 (terminal No. 6).
STEP 17. Check harness connector C-14 at OSS-ECU connector for damage.
STEP 18. Check for harness damage between OSS-ECU connector C-14 (terminal No. 7) and ETACS-ECU connector C-417 (terminal No. 6).
STEP 19. Check for harness damage between ETACS-ECU connector C-403 (terminal No. 10) and ECM connector B-27 (terminal No. 92).
STEP 20. Measure the power supply voltage at ECM harness side connector B-27.
(1) Disconnect the connector B-27 and measure at the harness side.
(2) Measure the voltage between terminal No. 104 and ground.- Voltage should be battery positive voltage.
Is battery positive voltage (approximately 12 volts) present?
Go to Step 21. Repair harness wire between fusible link (36) and ECM connector B-27 (terminal No. 104) because of open circuit or short circuit to ground. Then confirm that the malfunction symptom is eliminated.
STEP 21. Check the continuity at ECM harness side connector B-27.
(1) Disconnect the connector B-27 and measure at the harness side.
(2) Check for the continuity between terminals No. 81, No. 93 and ground.- Continuity (2 ohms or less).
Does continuity exist?
Go to Step 22. Repair harness wire between ECM connector B-27 (terminal No. 81, No. 93) and ground because of open circuit or harness damage. Then confirm that the malfunction symptom is eliminated.
STEP 22. Measure the power supply voltage at ECM harness side connector B-27.
(1) Disconnect the connector B-27 and measure at the harness side.
(2) Measure the voltage between terminal No. 73 and ground.- Voltage should be battery positive voltage.
Is battery positive voltage (approximately 12 volts) present?
Go to Step 23. Repair harness wire between MFI relay connector A-37X (terminal No. 1) and ECM connector B-27 (terminal No. 73) because of open circuit or short circuit to ground. Then confirm that the malfunction symptom is eliminated.
STEP 23. Measure the power supply voltage at ECM harness side connector B-27.
(1) Disconnect the connector B-27 and measure at the harness side.
(2) Short-circuit the terminal No. 73 of the ECM harness connector to the ground.
(3) Measure the voltage between terminal No. 82 and ground.- Voltage should be battery positive voltage.
Is battery positive voltage (approximately 12 volts) present?
Go to Step 26. Go to Step 24.
STEP 24. Check for open circuit and short circuit to ground between MFI relay connector A-37X (terminal No. 2) and ECM connector B-27 (terminal No. 82).
STEP 25. Check for harness damage between fusible link (36) and MFI relay connector A-37X (terminal No. 3, No. 4).
Is the harness wire in good condition?
Repair harness wire between MFI relay connector A-37X (terminal No. 1) and ECM connector B-27 (terminal No. 73) because of harness damage. Then confirm that the malfunction symptom is eliminated. Repair it. Then confirm that the malfunction symptom is eliminated.
STEP 26. Check for harness damage between MFI relay connector A-37X (terminal No. 2) and ECM connector B-27 (terminal No. 82).